This important measurement was made using Cassini's INMS instrument, which detects gases with the goal of determining their composition. INMS was designed to sample the upper atmosphere of Saturn's large, smoggy moon Titan. However, after Cassini's surprising discovery of a tall plume if icy spray erupting from cracks on Enceladus in 2005, planetary scientists turned its detectors to that small moon.

It makes sense, then, that the most potent example of astrological synastry (harmony between two birth charts) involves contact between one person's Sun and the other person's Moon, or contact between the two Moons. Carl Jung, the renowned Swiss Psychologist, famously conducted a 'marriage experiment' in which he studied the birth charts of over 500 couples. What he found was an unmistakable trend of Sun-Moon contact between partners. To most astrologers, this came as no surprise-it has long been understood that when one person's Moon hits another person's chart in a significant way, there exists a strong possibility of lasting and meaningful romance.

First launched as GRAIL A and GRAIL B in September 2011, the two probes, playfully dubbed Ebb and Flow, operated in an almost-circular orbit near the lunar poles at an altitude of about 34 miles until their mission concluded in December 2012. The distance between the twin probes altered slightly as they flew over areas of lesser or greater gravity that resulted from visible features--such as craters and mountains--as well as by hidden masses secreted beneath our Moon's surface.